file-length (ANSI and GNU Common Lisp Document)

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#### 21.2.26 file-length [Function]

`file-length` stream ⇒ length

#### Arguments and Values::

stream—a stream associated with a file.

length—a non-negative integer or nil.

#### Description::

file-length returns the length of stream, or nil if the length cannot be determined.

For a binary file, the length is measured in units of the element type of the stream.

#### Examples::

     (with-open-file (s "decimal-digits.text"
                        :direction :output :if-exists :error)
       (princ "0123456789" s)
       (truename s))
    ⇒  #P"A:>Joe>decimal-digits.text.1"
     (with-open-file (s "decimal-digits.text")
       (file-length s))
    ⇒  10

#### Exceptional Situations::

Should signal an error of type type-error if stream is not a stream associated with a file.

#### See Also::

open